CN103873625B - A kind of enhancing receives the method for speech loudness, device and mobile terminal - Google Patents
A kind of enhancing receives the method for speech loudness, device and mobile terminal Download PDFInfo
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Abstract
The invention discloses a kind of enhancing and receive the method for speech loudness, device and mobile terminal, belong to technical field of noise treatment.The method comprises: gather first sound tone signal by the first microphone, and second microphone gathers second sound signal; First sound tone signal and second sound signal are processed, filters out user voice signal; According to the intensity of user voice signal estimation background noise; Intensity determination audio frequency according to background noise receives frequency response curve.Adopt the present invention, on the basis of dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, suitable audio frequency reception frequency response curve is selected to strengthen the loudness of partner voice according to the intensity of ambient noise signal, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Description
Technical field
The present invention relates to technical field of noise treatment, particularly relate to a kind of enhancing and receive the method for speech loudness, device and mobile terminal.
Background technology
Flourish along with mobile communication technology; the mobile terminals such as mobile phone are more and more universal; almost become requisite communication tool in people's daily life; people can run into noisy environment usually when use mobile phone is made a phone call; as time on supermarket or road traffic route is difficult to hear the other side's voice; even if mobile phone call volume be adjusted to maximum user or use mobile phone earplug to converse, be also difficult to not hear.
Dual microphone noise reduction technology is the noise reduction technology that application is the most general at present, the microphone that a microphone uses when being common user's communication, for collecting user speech, and another microphone is arranged on mobile terminal top or the back side, for gathering ambient noise.Like this when user's communication, eliminate principle according to signal, the noisy background sound signal of the microphone collection on top is carried out oppositely, be superimposed upon on original conversation signal and abate the noise to reach.But be after the ambient noise residing for user being eliminated from the voice signal sent out, send call opposite end to like this, allow partner hear clearly; And user oneself does not still hear the words sound of the other side owing to being in noisy environment.Exactly because this, be in noisy environmental noise according to user oneself, adjustment audio frequency receives frequency response curve and strengthens the voice intensity received, and makes user not hear the other side's words sound problem demanding prompt solution.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of method and the mobile terminal that strengthen reception speech loudness, to solve the technical problem that the noisy environment of user is difficult to hear partner voice.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
According to an aspect of the present invention, a kind of method receiving speech loudness that strengthens provided comprises:
Gather first sound tone signal by the first microphone, second microphone gathers second sound signal;
First sound tone signal and second sound signal are processed, filters out user voice signal;
According to the intensity of user voice signal estimation background noise;
Intensity determination audio frequency according to background noise receives frequency response curve.
Preferably, first sound tone signal comprises the user voice signal and background noise that the first microphones arrives; Second sound signal comprises user second voice signal and background noise that second microphone receives.
Preferably, process first sound tone signal and second sound signal, the voice signal filtering out user comprises further:
Second sound signal is changed into contrary signal, carries out superposing with first sound tone signal and offset, filter out user voice signal.
Preferably, comprise further according to the intensity of user voice signal assessment background noise:
First sound tone signal is deducted user voice signal, obtains the intensity of background noise.
Preferably, receive frequency response curve according to assessment result determination audio frequency to comprise further:
When the intensity of background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise environment of system default to receive frequency response curve and the audio frequency that down direction receives is processed.
When the intensity of background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.
Preferably, receive frequency response curve according to assessment result determination audio frequency also to comprise:
When the intensity of background noise is greater than default noise intensity threshold value, and when receiving mode is not max volume, volume is adjusted to max volume.
According to another aspect of the present invention, a kind of device receiving speech loudness that strengthens provided comprises:
Sound acquisition module, for gathering first sound tone signal by the first microphone, second microphone gathers second sound signal;
Signal processing module, for processing first sound tone signal and second sound signal, filters out user voice signal;
Noise intensity estimation block, for the intensity according to user voice signal estimation background noise;
Audio frequency receives frequency response curve determination module, according to the intensity of user voice signal assessment background noise, and receives frequency response curve according to assessment result determination audio frequency.
Preferably, signal processing module specifically for: second sound signal is changed into contrary signal, carries out superposing with first sound tone signal and offset, filter out user voice signal;
Noise intensity estimation block specifically for: first sound tone signal is deducted user voice signal, obtains the intensity of background noise.
Preferably, audio frequency receive frequency response curve determination module specifically for:
When the intensity of background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise environment of system default to receive frequency response curve and the audio frequency that down direction receives is processed;
When the intensity of background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.
According to a further aspect of the invention, a kind of mobile terminal provided, comprises at least two microphones, and the first microphone is set to microphone of conversing, and second microphone is arranged on fuselage top or the back side, also comprises the device that above-mentioned enhancing receives speech loudness.
Compared with prior art, the enhancing of the embodiment of the present invention receives method and the mobile terminal of speech loudness, by on the basis of dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine that whether adjusting audio frequency receives frequency response curve according to the intensity of ambient noise signal, select suitable audio frequency reception frequency response curve to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Accompanying drawing explanation
The method flow diagram of the enhancing reception speech loudness that Fig. 1 provides for the embodiment of the present invention.
The audio frequency of the employing non-noise that Fig. 2 provides for the embodiment of the present invention receives the all-pass curve synoptic diagram of frequency response curve process.
Fig. 3 for the embodiment of the present invention provide adopt noise audio frequency receive frequency response curve to the curve synoptic diagram after the enhancing of primitive curve 800HZ-2000HZ frequency loudness.
The apparatus module structure chart of the enhancing reception speech loudness that Fig. 4 provides for the embodiment of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearly, understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment one
As shown in Figure 1, the embodiment of the present invention provides the method strengthening reception speech loudness to comprise the following steps:
S101, gather first sound tone signal by the first microphone, second microphone gathers second sound signal.
Wherein, the first microphone is arranged at the position of mobile terminal normal talking, and second microphone is then arranged on mobile terminal top or the back side, distance the first microphone at least 10 cm distance.First sound tone signal comprises the user voice signal and background noise that the first microphones arrives; Second sound signal comprises user second voice signal and background noise that second microphone receives.
Specifically, first sound tone signal (is designated as Signal
mIC1) comprise the first microphones to first user voice signal (be designated as Signal
mIC1_voice) and the first background noise (be designated as Signal
mIC1_noise); Second sound signal (is designated as Signal
mIC2) comprise the second user voice signal that second microphone receives and (be designated as Signal
mIC2_voice) and the second background noise (be designated as Signal
mIC2_noise), namely there is following equation:
Signal
MIC1=Signal
MIC1_voice+Signal
MIC1_noise
Signal
MIC2=Signal
MIC2_voice+Signal
MIC2_noise
The microphone position required due to dual microphone noise reduction technology is different, and second microphone is then arranged on mobile terminal top or the back side, distance the first microphone at least 10 cm distance, therefore the user voice signal Signal that second microphone gathers
mIC2_voicesignal is more weak, and two for background noise, the Signal that two microphones gather respectively
mIC1_noise andsignal
mIC2_noisesubstantially be the same.Therefore can by Signal
mIC1_voiceregard user voice signal as, Signal
mIC1_noise andsignal
mIC2_noiseall regard ambient noise signal as.
S102, first sound tone signal and second sound signal to be processed, filter out user voice signal.
Preferably, in the digital signal processor of mobile terminal, second sound signal is changed into contrary signal, carry out superposing with first sound tone signal and offset, filter out user voice signal.
Specifically, namely by dual microphone noise reduction algorithm (this algorithm is industry current techique), the sound wave sound wave entering second microphone being changed into contrary sound wave and the first microphone filters out the voice signal that the first microphones arrives after offsetting.
S103, according to user voice signal estimation background noise intensity.
Preferably, first sound tone signal is deducted user voice signal, obtain the intensity of background noise.
S104, receive frequency response curve according to the intensity determination audio frequency of background noise.
Preferably, when the intensity of background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of non-noise environment to receive frequency response curve and the audio frequency that down direction receives is processed; When the intensity of background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.Wherein, noise intensity threshold value can system default, also can pass through the self-defined contextual model of software, for example, when user is set to 80DB in the noise assessment threshold value of noisy supermarket or noisy highway; When user is set to 60DB in the noise assessment threshold value of coffee-house.
Wherein, audio frequency is received frequency response curve and can be debugged by equalization filter, weakens or compensate low frequency or high frequency.In order to the technique effect of the embodiment of the present invention is described better, refer to group experimental data of shown in Fig. 2 and Fig. 3, its transverse axis is frequency, and the longitudinal axis is decibel value.The all-pass filter of the acquiescence that Fig. 2 adopts, the state of equalization filter is reset state, and this state does not weaken any frequency or compensates.Now, the frequency response curve of reception is the frequency response curve of all-pass.On the all-pass filter basis of Fig. 2, by the enhancing to 800HZ-2000HZ frequency loudness, the weakening of below 800HZ signal, increase the susceptibility of people's ear to sound sense of hearing, equalization filtering curve shows as shown in Figure 3, can be found out by the frequency response curve of Fig. 2 and Fig. 3, people's ear has the loudness of general 6DB to promote in sensitizing range.Certainly, when electrical power is certain, the lifting of this part hearing loudness is to sacrifice low-frequency component for cost.
The method of the embodiment of the present invention, by on the basis of dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine that whether adjusting audio frequency receives frequency response curve according to the intensity of ambient noise signal, suitable audio frequency reception frequency response curve is selected to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Embodiment two
Refer to Fig. 1 equally, the present embodiment two is optimized further on the basis of embodiment one: in step S104, receive in frequency response curve according to the intensity determination audio frequency of background noise and also comprise: when the intensity of background noise is greater than default noise intensity threshold value, and receiving mode is not when being max volume, volume is adjusted to max volume.Guarantee like this, after the audio frequency selecting the audio frequency of the noise circumstance preset reception frequency response curve to receive down direction processes, on the basis of improving loudness, the quality of the voice signal received can be ensured.
Embodiment three
As shown in Figure 4, a kind of device receiving speech loudness that strengthens that the embodiment of the present invention provides comprises with lower module:
Sound acquisition module 10, for gathering first sound tone signal by the first microphone, second microphone gathers second sound signal;
Signal processing module 20, for processing first sound tone signal and second sound signal, filters out user voice signal.
Wherein, signal processing module 20, for second sound signal is changed into contrary signal, carries out superposing with first sound tone signal and offsets, filter out user voice signal.
Specifically, namely by dual microphone noise reduction algorithm, the sound wave sound wave entering second microphone being changed into contrary sound wave and the first microphone filters out the voice signal that the first microphones arrives after offsetting.
Noise intensity estimation block 30, for the intensity according to user voice signal estimation noise signal.
Wherein, noise intensity estimation block 30, specifically for first sound tone signal is deducted user voice signal, obtains the intensity of background noise.
Audio frequency receives frequency response curve determination module 40, according to the intensity of user voice signal assessment noise signal, and receives frequency response curve according to assessment result determination audio frequency.
Wherein, audio frequency receive frequency response curve determination module 40 specifically for: when the intensity of background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise environment of system default to receive frequency response curve and the audio frequency that down direction receives processed; When the intensity of background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.
It should be noted that, the technical characteristic in said method embodiment one and embodiment two all can correspondingly be suitable at this device, no longer repeats here.
Correspondingly, present invention also offers a kind of mobile terminal, this mobile terminal comprises at least two microphones, and the first microphone is set to microphone of conversing, second microphone is arranged on fuselage top or the back side, and the enhancing also comprising above-described embodiment three receives the device of speech loudness.
Specifically, the first microphone is arranged at the position of mobile terminal normal talking, and second microphone is then arranged on mobile terminal top or the back side, distance the first microphone at least 10 cm distance.The user voice signal that first microphones arrives and background noise; User second voice signal that second microphone receives and background noise.Strengthen the device receiving speech loudness and pass through dual microphone noise reduction algorithm, after the sound wave sound wave entering second microphone being changed into contrary sound wave and the first microphone is offset, filter out the voice signal that the first microphones arrives, according to the intensity of user voice signal estimation noise signal, according to the intensity of user voice signal assessment noise signal, and the audio frequency that down direction receives is processed, to strengthen the loudness of partner voice according to assessment result determination audio frequency reception frequency response curve.
The enhancing of above-described embodiment receives device and the mobile terminal of speech loudness, by on the basis of dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine that whether adjusting audio frequency receives frequency response curve according to the intensity of ambient noise signal, suitable audio frequency reception frequency response curve is selected to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Above with reference to the accompanying drawings of the preferred embodiments of the present invention, not thereby limit to interest field of the present invention.Those skilled in the art do not depart from the scope and spirit of the present invention interior done any amendment, equivalent replacement and improve, all should within interest field of the present invention.
Claims (10)
1. strengthen the method receiving speech loudness, it is characterized in that, described method comprises:
Gather first sound tone signal by the first microphone, second microphone gathers second sound signal;
Described first sound tone signal and second sound signal are processed, filters out user voice signal;
According to the intensity of described user voice signal estimation background noise;
Intensity determination audio frequency according to described background noise receives frequency response curve, optionally strengthens the loudness of human auditory system sensitizing range frequency range, weakens the loudness of human auditory system non-sensitive district frequency range.
2. according to claim 1 enhancing receives the method for speech loudness, it is characterized in that, described first sound tone signal comprises the user voice signal and background noise that the first microphones arrives; Described second sound signal comprises user second voice signal and background noise that second microphone receives.
3. the method strengthening reception speech loudness according to claim 2, it is characterized in that, process described first sound tone signal and second sound signal, the voice signal filtering out user comprises further:
Described second sound signal is changed into contrary signal, carries out superposing with described first sound tone signal and offset, filter out user voice signal.
4. the method strengthening reception speech loudness according to claim 1, is characterized in that, the intensity according to described user voice signal assessment background noise comprises further:
Described first sound tone signal is deducted described user voice signal, obtains the intensity of background noise.
5. enhancing according to claim 1-4 any one claim receives the method for speech loudness, it is characterized in that, describedly receives frequency response curve according to assessment result determination audio frequency and comprises further:
When the intensity of described background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise environment of system default to receive frequency response curve and the audio frequency that down direction receives is processed;
When the intensity of described background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.
6. according to claim 5 enhancing receives the method for speech loudness, it is characterized in that, describedly receives frequency response curve according to assessment result determination audio frequency and also comprises:
When the intensity of described background noise is greater than default noise intensity threshold value, and when receiving mode is not max volume, volume is adjusted to max volume.
7. strengthen the device receiving speech loudness, it is characterized in that, described device comprises:
Sound acquisition module, for gathering first sound tone signal by the first microphone, second microphone gathers second sound signal;
Signal processing module, for processing described first sound tone signal and second sound signal, filters out user voice signal;
Noise intensity estimation block, for the intensity according to described user voice signal estimation background noise;
Audio frequency receives frequency response curve determination module, according to the intensity of described user voice signal assessment background noise, and receive frequency response curve according to assessment result determination audio frequency, optionally the loudness of human auditory system sensitizing range frequency range is strengthened, the loudness of human auditory system non-sensitive district frequency range is weakened.
8. the device strengthening reception speech loudness according to claim 7, is characterized in that:
Described signal processing module specifically for: described second sound signal is changed into contrary signal, carries out superposing with described first sound tone signal and offset, filter out user voice signal;
Described noise intensity estimation block specifically for: described first sound tone signal is deducted described user voice signal, obtains the intensity of background noise.
9. according to claim 7 enhancing receives the device of speech loudness, it is characterized in that, described audio frequency receive frequency response curve determination module specifically for:
When the intensity of described background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise environment of system default to receive frequency response curve and the audio frequency that down direction receives is processed;
When the intensity of described background noise is greater than default noise intensity threshold value, selects the audio frequency of the noise circumstance preset to receive frequency response curve and the audio frequency that down direction receives is processed.
10. a mobile terminal, comprise at least two microphones, first microphone is set to microphone of conversing, second microphone is arranged on fuselage top or the back side, it is characterized in that, the enhancing also comprised described in claim 7 ~ 9 any one claim of this mobile terminal receives the device of speech loudness.
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